EP1749644A1 - Method of manufacturing plastic articles - Google Patents
Method of manufacturing plastic articles Download PDFInfo
- Publication number
- EP1749644A1 EP1749644A1 EP05017000A EP05017000A EP1749644A1 EP 1749644 A1 EP1749644 A1 EP 1749644A1 EP 05017000 A EP05017000 A EP 05017000A EP 05017000 A EP05017000 A EP 05017000A EP 1749644 A1 EP1749644 A1 EP 1749644A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixture
- plastic parts
- heated
- extruder
- plastic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/58—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres
- B29C70/66—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres the filler comprising hollow constituents, e.g. syntactic foam
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
Definitions
- the invention relates to a method for producing plastic parts, in particular plastic profiles, in which fillers are introduced into a powdery or granular thermoplastic carbon material, this mixture is heated and molded into the plastic parts.
- fillers in this known process can serve a variety of purposes.
- the fillers in particular the price of the finished product can be reduced when relatively expensive plastic fillers are added, which are cheaper, of course, while it must be ensured that the quality of the finished product is not worse than that required for the desired purpose is. So you will z. B. in plastic packaging often do not attach special importance to high quality, but rather at low cost.
- the object of the invention is to provide a method of the type mentioned, with the plastic parts can be made of significantly lower weight without major loss of quality occur.
- the solution according to the invention is that expandable hollow particles are used as fillers which are filled with a liquid which evaporates at elevated temperature.
- thermoplastic material If the thermoplastic material is converted into the plastic state by means of heating, the liquid in the expandable hollow particles evaporates at the same time, so that its volume increases. If the finished part is then cooled, so remain larger cavities in the plastic part due to the expandable hollow particles, whereby the weight of the plastic part is less than if it would consist of solid plastic.
- hollow spheres will be used as fillers.
- thermoplastic polypropylene is very suitable.
- Another thermoplastic that can be used is polyethylene, which is heated to temperatures of about 170 ° C during manufacture of the plastic parts.
- an acrylonitrile copolymer As a material from which the shell was made in the fillers, an acrylonitrile copolymer has been found to be particularly advantageous.
- the average particle size is advantageously about 10 to 30 microns, wherein the shell thickness is advantageously about 3 to 7 microns.
- the plastic parts are produced by injection molding.
- the plastic parts are produced by the extrusion process.
- a lower processing temperature is possible than in the injection molding process, since the hollow particles, in particular the hollow spheres in the extruder linger longer time and therefore have more time to warm up.
- the temperature must not be so high that the particles are destroyed.
- the extent of expansion of the hollow particles or hollow spheres can be controlled by temperature.
- the hollow spheres are made of thermoplastic material and are filled with liquid hydrocarbon.
- the initially more or less rigid hollow spheres are thus also softened when heating the plastic material and can, as the hydrocarbons evaporate in the interior, expand. During the subsequent cooling, although a certain shrinkage occurs.
- the volume is far from the initial volume, so in this way take the fillers in the finished plastic part much more space than was the case before molding.
- the volume of the hollow particles in the case of hollow spheres increases up to 30 times, 40 times or even more.
- the fillers which in particular have a particle size of about 10 to 30 microns, mix well with the plastic material, it has proved to be useful to add silicone oil to the mixture, which is heated to reduce its viscosity. As a result, it can be achieved that the entire mixture is wetted well with silicone, so that plastic material particles and filler particles can be uniformly mixed.
- silicone oil quantities which are substantially less than 1% by weight or even less than 1% by weight of the mixture are sufficient.
- the silicone oil may be heated to temperatures of about 250 ° C prior to adding.
- the residence time of the mixture in the extruder is advantageously 10 to 40 seconds in the case of using polycarbonate as a thermoplastic.
- the temperatures in the extruder are in the range of 200 ° C to 300 ° C.
- the extruder is divided into several areas in which different temperatures prevail. In the filling zone, where the granules are supplied, there is initially a relatively low temperature. It may even be cooled here so that this part of the extruder is not overheated by the subsequent high-temperature zone. The expansion of the hollow particles takes place in this zone of higher temperature which follows in the working direction. Before exiting the extruder, the material is then returned to a lower temperature to prevent further expansion. In particular, one of course wants to avoid that the material expands uncontrollably after the escape.
- the extruder is constructed conventionally and does not have to be modified compared to known extruders. He therefore need not be described here in detail. For the understanding, it should only be mentioned that in an extruder, the material is mixed and heated by one or more screw conveyors and pressed against a narrow outlet opening.
- the plastic parts are cooled after exiting the extruder so that they do not expand uncontrolled further here or deform.
- these are passed after exiting the extruder between the cooling and calibration surfaces. This not only causes a relatively rapid cooling. Rather, the profiles are also brought into the desired shape, the can not be achieved by extrusion alone with this accuracy.
- cooling and calibration surfaces can be resiliently mounted.
- this flexibility must not be too big. In any case, it must be ensured that the dimensional deviations of the finished particles from predefined values lie within predefined tolerance limits.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Herstellen von Kunststoffteilen, insbesondere Kunststoffprofilen, bei dem Füllstoffe in ein pulver- oder granulatförmiges thermoplastisches Kohlenstoffmaterial eingebracht werden, diese Mischung erwärmt und in die Kunststoffteile geformt wird.The invention relates to a method for producing plastic parts, in particular plastic profiles, in which fillers are introduced into a powdery or granular thermoplastic carbon material, this mixture is heated and molded into the plastic parts.
Die Einbringung von Füllstoffen bei diesem bekannten Verfahren kann verschiedenen Zwecken dienen. Durch die Füllstoffe kann insbesondere der Preis des fertigen Erzeugnisses verringert werden, wenn relativ teurem Kunststoff Füllstoffe zugefügt werden, die billiger sind, wobei selbstverständlich dabei darauf geachtet werden muss, dass die Qualität des fertigen Produktes nicht schlechter wird, als dies für den gewünschten Zweck erforderlich ist. So wird man z. B. bei Verpackungsteilen aus Kunststoff häufig keinen besonderen Wert auf hohe Qualität, sondern eher auf geringe Kosten legen.The incorporation of fillers in this known process can serve a variety of purposes. The fillers in particular the price of the finished product can be reduced when relatively expensive plastic fillers are added, which are cheaper, of course, while it must be ensured that the quality of the finished product is not worse than that required for the desired purpose is. So you will z. B. in plastic packaging often do not attach special importance to high quality, but rather at low cost.
In vielen Fällen kommt es aber nicht so sehr auf den Preis, als vielmehr auf das Gewicht bzw. Gewichtsersparnis bei den Kunststoffteilen an. Dies trifft insbesondere für die Flugzeugindustrie zu, wo man immer bestrebt ist, Teile durch leichtere Teile zu ersetzen, soweit diese trotz ihres geringeren Gewichtes noch den strengen Qualitätsanforderungen genügen.In many cases, it is not so much the price, but rather the weight or weight savings in the plastic parts. This is particularly true for the aircraft industry, where one always strives to replace parts with lighter parts, as far as they still meet the stringent quality requirements despite their lower weight.
Die Aufgabe der Erfindung besteht in der Schaffung eines Verfahrens der eingangs genannten Art, mit dem Kunststoffteile von wesentlich geringerem Gewicht hergestellt werden können, ohne dass große Qualitätseinbussen auftreten.The object of the invention is to provide a method of the type mentioned, with the plastic parts can be made of significantly lower weight without major loss of quality occur.
Die erfindungsgemäße Lösung besteht darin, dass expandierbare hohle Teilchen als Füllstoffe verwendet werden, die mit einer bei erhöhter Temperatur verdampfenden Flüssigkeit gefüllt sind.The solution according to the invention is that expandable hollow particles are used as fillers which are filled with a liquid which evaporates at elevated temperature.
Wird mit Hilfe von Erwärmung das thermoplastische Kunststoffmaterial in den plastischen Zustand übergeführt, so verdampft gleichzeitig die Flüssigkeit in den expandierbaren hohlen Teilchen, so dass sich deren Volumen erhöht. Wird das fertige Teil dann abgekühlt, so bleiben aufgrund der expandierbaren hohlen Teilchen größere Hohlräume im Kunststoffteil bestehen, wodurch das Gewicht des Kunststoffteils geringer wird, als wenn es aus massivem Kunststoff bestehen würde.If the thermoplastic material is converted into the plastic state by means of heating, the liquid in the expandable hollow particles evaporates at the same time, so that its volume increases. If the finished part is then cooled, so remain larger cavities in the plastic part due to the expandable hollow particles, whereby the weight of the plastic part is less than if it would consist of solid plastic.
Insbesondere wird man Hohlkugeln als Füllstoffe verwenden.In particular, hollow spheres will be used as fillers.
Als thermoplastischer Kunststoff ist Polypropylen sehr geeignet. Ein anderer thermoplastischer Kunststoff, der Verwendung finden kann, ist Polyethylen, das bei der Herstellung der Kunststoffteile auf Temperaturen von ungefähr 170°C erwärmt wird.As thermoplastic polypropylene is very suitable. Another thermoplastic that can be used is polyethylene, which is heated to temperatures of about 170 ° C during manufacture of the plastic parts.
Insbesondere hat es sich aber als besonders vorteilhaft herausgestellt, wenn Polycarbonat als thermoplastischer Kunststoff verwendet wird und die Mischung auf Temperaturen von bis zu ungefähr 300°C erwärmt wird. Es ist also eine wesentlich größere Erwärmung möglich, als dies bei Polypropylen oder Polyethylen der Fall ist. Diese und ähnliche Kunststoffe haben nämlich einen Schmelzpunkt von bis zu 220°C, so dass sie bei Temperaturen von ungefähr 300°C nicht verarbeitet werden können.In particular, it has been found to be particularly advantageous when polycarbonate is used as a thermoplastic and the mixture is heated to temperatures of up to about 300 ° C. So it is a much greater heating possible than is the case with polypropylene or polyethylene. This and similar plastics have namely a melting point of up to 220 ° C, so that they can not be processed at temperatures of about 300 ° C.
Als Material, aus denen die Hülle in der Füllstoffe hergestellt werden war, hat sich ein Acrylnitril-Copolymer als besonders vorteilhaft erwiesen. Die durchschnittliche Partikelgröße liegt dabei vorteilhafterweise ungefähr 10 bis 30 µm, wobei die Hüllenstärke vorteilhafterweise circa 3 bis 7 µm beträgt.As a material from which the shell was made in the fillers, an acrylonitrile copolymer has been found to be particularly advantageous. The average particle size is advantageously about 10 to 30 microns, wherein the shell thickness is advantageously about 3 to 7 microns.
Zweckmäßigerweise werden die Kunststoffteile im Spritzgussverfahren hergestellt.Appropriately, the plastic parts are produced by injection molding.
Beim Spritzgussverfahren muss mit höherer Verarbeitungstemperatur als bei reinem Kunststoff gearbeitet werden, da der Füllstoff in Folge der Verdampfung Wärme aufnimmt. Es ist auch erforderlich, die Einspritzdüse während der Aushärtung zu verschließen, da sonst das Material unter Exparsion herausquillt. Bevor das fertige Kunststoffteil aus der Form herausgenommen wird, muss es genügend gekühlt werden, da es sonst weiter unkontrolliert aufquillt. Dies kann entweder dadurch geschehen, dass die Form gekühlt wird, man länger bis zum Herausnehmen wartet oder man die Hohlkugeln vollständig expandieren lässt, bevor das Material in die Form eingegeben wird. Dies alles sind aber Probleme, die technisch lösbar sind, so dass das Spritzgussverfahren sehr vorteilhaft ist.In the injection molding process must be used with higher processing temperature than with pure plastic, since the filler absorbs heat as a result of evaporation. It is also necessary to close the injection nozzle during curing, otherwise the material swells under Exparsion. Before the finished plastic part is removed from the mold, it must be sufficiently cooled, otherwise it will continue to swell uncontrollably. This can be done either by cooling the mold, waiting longer to remove, or by allowing the hollow spheres to expand completely before the material is introduced into the mold. But these are all problems that are technically solvable, so that the injection molding process is very beneficial.
Als besonders vorteilhaft hat es sich aber erwiesen, wenn die Kunststoffteile im Extrusionsverfahren hergestellt werden. Hierbei ist eine niedrigere Verarbeitungstemperatur als beim Spritzgussverfahren möglich, da die hohlen Teilchen, insbesondere die Hohlkugeln im Extruder längere Zeit verweilen und daher mehr Zeit haben, sich aufzuwärmen. Die Temperatur darf allerdings nicht so hoch gewählt werden, dass die Teilchen zerstört werden.However, it has proved to be particularly advantageous if the plastic parts are produced by the extrusion process. In this case, a lower processing temperature is possible than in the injection molding process, since the hollow particles, in particular the hollow spheres in the extruder linger longer time and therefore have more time to warm up. However, the temperature must not be so high that the particles are destroyed.
Das Ausmaß der Expansion der hohlen Teilchen bzw. Hohlkugeln kann über die Temperatur gesteuert werden.The extent of expansion of the hollow particles or hollow spheres can be controlled by temperature.
Insbesondere bestehen die Hohlkugeln aus thermoplastischem Material und sind mit flüssigem Kohlenwasserstoff gefüllt. Die zunächst mehr oder weniger starren Hohlkugeln werden also bei der Erwärmung des Kunststoffmaterials ebenfalls erweicht und können sich, da die Kohlenwasserstoffe im Inneren verdampfen, expandieren. Bei der anschließenden Abkühlung tritt zwar eine gewisse Schrumpfung auf. Erstaunlicherweise geht aber das Volumen bei weitem nicht auf das Anfangsvolumen zurück, auf diese Weise nehmen also die Füllstoffe im fertigen Kunststoffteil wesentlich mehr Raum ein, als dies vor der Formung der Fall war. So kann ohne weiteres erreicht werden, dass sich das Volumen der hohlen Teilchen im Falle von Hohlkugeln bis auf das 30-fache, 40-fache oder noch mehr erhöht.In particular, the hollow spheres are made of thermoplastic material and are filled with liquid hydrocarbon. The initially more or less rigid hollow spheres are thus also softened when heating the plastic material and can, as the hydrocarbons evaporate in the interior, expand. During the subsequent cooling, although a certain shrinkage occurs. Surprisingly, however, the volume is far from the initial volume, so in this way take the fillers in the finished plastic part much more space than was the case before molding. Thus, it can be easily achieved that the volume of the hollow particles in the case of hollow spheres increases up to 30 times, 40 times or even more.
Als Treibmittel haben sich jeweils 2,5 bis 10 Gewichtsprozent, bezogen auf die Gesamtmasse der Hohlkugeln, an 3-Metylpentan und/oder 2-Metylpentan erwiesen. Vorteilhaft sind auch 7 bis 15 Gewichtsprozent Isooctan.In each case 2.5 to 10 percent by weight, based on the total mass of the hollow spheres, of 3-methylpentane and / or 2-methylpentane have proven to be blowing agents. Also advantageous are 7 to 15 weight percent isooctane.
Damit sich die Füllstoffe, die insbesondere eine Teilchengröße von etwa 10 bis 30µm haben, gut mit dem Kunststoffmaterial mischen, hat es sich als zweckmäßig erwiesen, der Mischung Silikonöl zuzugeben, das erwärmt ist, um dessen Viskosität zu verringern. Dadurch kann erreicht werden, dass die gesamte Mischung gut mit Silikon benetzt wird, so dass Kunststoffmaterialteilchen und Füllstoffteilchen gleichmäßig vermischt werden können. Es reichen hier Silikonölmengen, die wesentlich weniger als 1 Gew.-% oder sogar als 1 Gew.-Promille der Mischung betragen. Insbesondere kann das Silikonöl auf Temperaturen von ungefähr 250°C vor dem Zugeben erwärmt werden.Thus, the fillers, which in particular have a particle size of about 10 to 30 microns, mix well with the plastic material, it has proved to be useful to add silicone oil to the mixture, which is heated to reduce its viscosity. As a result, it can be achieved that the entire mixture is wetted well with silicone, so that plastic material particles and filler particles can be uniformly mixed. Here, silicone oil quantities which are substantially less than 1% by weight or even less than 1% by weight of the mixture are sufficient. In particular, the silicone oil may be heated to temperatures of about 250 ° C prior to adding.
Die Verweilzeit der Mischung im Extruder beträgt vorteilhafterweise 10 bis 40 s im Falle der Verwendung von Polycarbonat als thermoplastischem Kunststoff. Die Temperaturen im Extruder liegen im Bereich von 200°C bis 300°C. Der Extruder ist dabei in mehrere Bereiche aufgeteilt, in denen unterschiedliche Temperaturen vorherrschen. In der Einfüllzone, wo das Granulat zugeführt wird, herrscht zunächst eine verhältnismäßig niedrige Temperatur. Möglicherweise wird hier sogar gekühlt, damit dieser Teil des Extruders durch die sich anschließende Hochtemperaturzone nicht zu sehr erwärmt wird. In dieser in Arbeitsrichtung sich anschließenden Zone höherer Temperatur findet die Expansion der hohlen Teilchen statt. Vor dem Austreten aus dem Extruder wird das Material dann wieder auf eine niedrigere Temperatur gebracht, um weitere Expansion zu verhindern. Insbesondere will man natürlich vermeiden, dass das Material nach dem Austreten unkontrolliert expandiert.The residence time of the mixture in the extruder is advantageously 10 to 40 seconds in the case of using polycarbonate as a thermoplastic. The temperatures in the extruder are in the range of 200 ° C to 300 ° C. The extruder is divided into several areas in which different temperatures prevail. In the filling zone, where the granules are supplied, there is initially a relatively low temperature. It may even be cooled here so that this part of the extruder is not overheated by the subsequent high-temperature zone. The expansion of the hollow particles takes place in this zone of higher temperature which follows in the working direction. Before exiting the extruder, the material is then returned to a lower temperature to prevent further expansion. In particular, one of course wants to avoid that the material expands uncontrollably after the escape.
Der Extruder ist dabei konventionell aufgebaut und muss gegenüber bekannten Extrudern nicht modifiziert werden. Er braucht daher hier nicht näher beschrieben zu werden. Für das Verständnis sollte nur erwähnt werden, dass in einem Extruder das Material durch eine oder mehrere Förderschnecken durchmischt und erwärmt wird und gegen eine enge Austrittsöffnung gedrückt wird.The extruder is constructed conventionally and does not have to be modified compared to known extruders. He therefore need not be described here in detail. For the understanding, it should only be mentioned that in an extruder, the material is mixed and heated by one or more screw conveyors and pressed against a narrow outlet opening.
Zweckmäßigerweise werden die Kunststoffteile nach dem Austritt aus dem Extruder gekühlt, damit sie hier nicht unkontrolliert weiter expandieren oder sich verformen. Insbesondere werden bei der Herstellung von Kunststoffprofilen diese nach dem Austritt aus dem Extruder zwischen Kühl- und Kalibrierflächen hindurchgeführt. Dadurch wird nicht nur eine verhältnismäßig rasche Kühlung bewirkt. Die Profile werden vielmehr auch in die gewünschte Form gebracht, die durch Extrusion allein mit dieser Genauigkeit nicht erzielt werden kann.Conveniently, the plastic parts are cooled after exiting the extruder so that they do not expand uncontrolled further here or deform. In particular, in the production of plastic profiles these are passed after exiting the extruder between the cooling and calibration surfaces. This not only causes a relatively rapid cooling. Rather, the profiles are also brought into the desired shape, the can not be achieved by extrusion alone with this accuracy.
Insbesondere können die Kühl- und Kalibrierflächen nachgiebig gelagert sein. Diese Nachgiebigkeit darf selbstverständlich nicht zu groß sein. Es muss auf jeden Fall sichergestellt sein, dass die Dimensionsabweichungen der fertigen Teilchen von vorgegebenen Werten innerhalb vorgegebener Toleranzgrenzen liegen.In particular, the cooling and calibration surfaces can be resiliently mounted. Of course, this flexibility must not be too big. In any case, it must be ensured that the dimensional deviations of the finished particles from predefined values lie within predefined tolerance limits.
Es hat sich herausgestellt, dass mit dem erfindungsgemäßen Verfahren Gewichtseinsparungen von 30 bis 50% erzielt werden können. Erstaunlicherweise ist trotzdem die Druck- und Zugfestigkeit nur in einem Ausmaß geringer als bei massiven Teilchen aus dem gleichen Kunststoff, das für viele Anwendungen insbesondere in der Flugzeugindustrie ohne weiteres akzeptiert werden kann. Es hat sich auch weiter gezeigt, dass die Brandfestigkeit des fertigen Erzeugnisses durch die in den hohlen Teilchen enthaltenen Kohlenwasserstoff nicht negativ beeinflusst wird.It has been found that weight savings of 30 to 50% can be achieved with the method according to the invention. Surprisingly, nevertheless, the compressive and tensile strength is only to a lesser extent than with massive particles of the same plastic, which can be easily accepted for many applications, especially in the aircraft industry. It has also been shown that the fire resistance of the finished product is not adversely affected by the hydrocarbons contained in the hollow particles.
Claims (18)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05017000A EP1749644A1 (en) | 2005-08-04 | 2005-08-04 | Method of manufacturing plastic articles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP05017000A EP1749644A1 (en) | 2005-08-04 | 2005-08-04 | Method of manufacturing plastic articles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1749644A1 true EP1749644A1 (en) | 2007-02-07 |
Family
ID=35311888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05017000A Withdrawn EP1749644A1 (en) | 2005-08-04 | 2005-08-04 | Method of manufacturing plastic articles |
Country Status (1)
| Country | Link |
|---|---|
| EP (1) | EP1749644A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015010380A1 (en) | 2015-08-07 | 2017-02-09 | Universität Kassel | Liquid or solid silicone in unvulcanized state and process for the processing of liquid and solid silicone by injection molding |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0511716A1 (en) * | 1991-04-30 | 1992-11-04 | The Dexter Corporation | Expandable films and molded products therefrom |
| US5218016A (en) * | 1986-05-16 | 1993-06-08 | Institut Francais Du Petrole | Filler and floatability material manufacturing process and tubular units that incorporate this material |
| US20020132100A1 (en) * | 2001-01-17 | 2002-09-19 | Akzo Nobel N.V | Process for producing objects |
| US20040063812A1 (en) * | 2000-03-31 | 2004-04-01 | Unigel Limited | Gel compositions |
| US20040197545A1 (en) * | 1998-07-31 | 2004-10-07 | 3M Innovative Properties Company | Articles that include a polymer foam and method for preparing same |
-
2005
- 2005-08-04 EP EP05017000A patent/EP1749644A1/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5218016A (en) * | 1986-05-16 | 1993-06-08 | Institut Francais Du Petrole | Filler and floatability material manufacturing process and tubular units that incorporate this material |
| EP0511716A1 (en) * | 1991-04-30 | 1992-11-04 | The Dexter Corporation | Expandable films and molded products therefrom |
| US20040197545A1 (en) * | 1998-07-31 | 2004-10-07 | 3M Innovative Properties Company | Articles that include a polymer foam and method for preparing same |
| US20040063812A1 (en) * | 2000-03-31 | 2004-04-01 | Unigel Limited | Gel compositions |
| US20020132100A1 (en) * | 2001-01-17 | 2002-09-19 | Akzo Nobel N.V | Process for producing objects |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015010380A1 (en) | 2015-08-07 | 2017-02-09 | Universität Kassel | Liquid or solid silicone in unvulcanized state and process for the processing of liquid and solid silicone by injection molding |
| WO2017025083A1 (en) | 2015-08-07 | 2017-02-16 | Universität Kassel | Unvulcanized liquid or solid silicone rubber and method for using liquid or solid silicone rubber in an injection method |
| DE102015010380B4 (en) | 2015-08-07 | 2020-05-20 | Universität Kassel | Use of liquid or solid silicone as a material for processing by injection molding |
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